JP6686739B2 - Fixing device and image forming apparatus - Google Patents

Fixing device and image forming apparatus Download PDF

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Publication number
JP6686739B2
JP6686739B2 JP2016129176A JP2016129176A JP6686739B2 JP 6686739 B2 JP6686739 B2 JP 6686739B2 JP 2016129176 A JP2016129176 A JP 2016129176A JP 2016129176 A JP2016129176 A JP 2016129176A JP 6686739 B2 JP6686739 B2 JP 6686739B2
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Prior art keywords
fixing
holding
web
cleaning
cleaning web
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JP2018004831A (en
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裕範 大島
裕範 大島
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株式会社リコー
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2032Retractable heating or pressure unit
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2025Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/206Structural details or chemical composition of the pressure elements and layers thereof
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2092Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using pressure only
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/01Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142Structure of complete machines
    • G03G15/0147Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0168Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member single rotation of recording member to produce multicoloured copy
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/65Apparatus which relate to the handling of copy material
    • G03G15/6517Apparatus for continuous web copy material of plain paper, e.g. supply rolls; Roll holders therefor
    • G03G15/652Feeding a copy material originating from a continuous web roll
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/00362Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535Stable handling of copy medium
    • G03G2215/00687Handling details
    • G03G2215/00708Cleaning of sheet or feeding structures
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00Apparatus for electrophotographic processes
    • G03G2215/20Details of the fixing device or porcess
    • G03G2215/2003Structural features of the fixing device
    • G03G2215/2016Heating belt
    • G03G2215/2035Heating belt the fixing nip having a stationary belt support member opposing a pressure member

Description

  The present invention relates to a fixing device and an image forming apparatus.

  In a fixing device including a fixing member, a pressure member, and the like, a part of the toner melted in the fixing nip portion may adhere to the surface of the fixing member, the pressure member, or the like. A cleaning mechanism is known as a means for cleaning the toner adhering to the surface of such a fixing member, a pressure member, and the like (hereinafter referred to as a pressure member).

  As a cleaning mechanism, a web sheet for rubbing the surface of the pressure member to clean the surface of the pressure member, a web holding member for holding the web sheet so that the web sheet can be delivered, and a winding member capable of winding the web sheet. And a pressing member that presses the web sheet against the pressing member, and a web corrugation preventing member that applies pressure to the web sheet so that wrinkles do not occur in the web sheet are already known (for example, Patent Document 1). 1).

  Patent Document 1 discloses a configuration in which a wrinkle is prevented by causing a rotatable member as a web waving preventing member to abut against the cleaning web with a constant pressure from the inside of the cleaning web, which is a web sheet, by a spring. . Further, as will be described in detail in an embodiment described later, there is also a configuration in which a leaf spring member having a simpler structure as the cleaning web corrugation preventing member is used to directly apply pressure to the cleaning web.

  However, when a leaf spring member is used as the cleaning web undulation prevention member, there is a problem that when the leaf spring member is assembled during the replacement of the cleaning web, the cleaning web cannot be easily replaced due to the pressure of the leaf spring member.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fixing device that can improve workability when replacing a cleaning web when a pressure contact member (leaf spring member) is assembled.

In order to achieve the above object, the present invention provides a fixing member having a heating unit, a pressure member that contacts the fixing member to form a fixing nip portion between the fixing member, the fixing member or the fixing member. And a cleaning unit configured to clean the surface of the pressure member, the recording medium holding a toner image passing through the fixing nip portion, and fixing the toner image on the recording medium by heat and pressure. The cleaning means includes a cleaning web for rubbing the surface of the fixing member or the pressure member to clean the surface of the fixing member or the pressure member, and a web holding member for holding the cleaning web so that the cleaning web can be delivered. A member, a winding member capable of winding the cleaning web, and a pressing member that presses the cleaning web against the fixing member or the pressing member, And a pressing member for preventing cleaning web wrinkles, which presses the cleaning web in a width direction orthogonal to the winding direction of the cleaning web, and temporarily holds the pressing member when the pressing member is assembled. The pressure contact member is held by a pressure contact holding member protruding from each end of the pressure contact member in the width direction, and the temporary holding means is attached to one end of the pressure contact holding member. A bar-shaped member formed and protruding in the width direction, and a hole formed in the main body of the apparatus capable of inserting the bar-shaped member, and a stepped square hole formed in the other end of the pressure contact holding member, The fixing device includes a convex portion formed on the main body of the apparatus that can be engaged with the square hole .

  According to the present invention, workability at the time of exchanging the cleaning web can be improved by the above configuration.

It is a schematic diagram showing a cleaning mechanism of a general fixing device to which the present invention is applied. FIG. 2 is a schematic diagram showing a cleaning mechanism of the fixing device to which the present invention is applied, which is different from FIG. FIG. 3 is a perspective view of a main part of the cleaning web unit according to the first embodiment as viewed from the front side. It is a perspective view which shows the simple substance shape of the leaf spring member before an assembly. FIG. 4 is a view seen from the arrow K side in FIG. 3, and is a perspective view showing an arrangement state of a leaf spring member and a holding frame at the time of assembly. (A) is a front view of the main part showing a state in which the leaf spring member is temporarily held by the temporary holding means of the cleaning web unit according to the first embodiment via the holding frame, and (b) is a holding frame. FIG. 7 is a front view of the main part showing an assembling state in which the leaf spring member can be assembled to the frame from a state in which the leaf spring member is temporarily held through. (A) is a front view showing a completed state of assembling a leaf spring member to a frame via a holding frame, and (b) is a perspective view of a main part when (a) is viewed in the direction of arrow J. FIG. 3 is a perspective view of a main part of the main part of the cleaning web unit according to the first embodiment as viewed from the back side. FIG. 1 is a schematic configuration diagram of an image forming apparatus including a fixing device to which the present invention is applied.

Hereinafter, embodiments of the present invention (hereinafter, referred to as “embodiments”) including examples will be described in detail with reference to the drawings. Throughout the embodiments and the like, components (members or components) having the same function, shape, etc. will be described once by the same reference numerals, and the description thereof will be omitted unless there is a risk of confusion. In order to simplify the drawings and the description, even if the constituent elements are to be shown in the drawing, the constituent elements that do not need to be particularly described in the drawing may be appropriately omitted without notice. When the constituent elements of the published patent publications and the like are cited and described, the reference numerals are given in parentheses to distinguish them from those of the embodiments and the like.
Note that the term "press" used in this specification means pressing and pressing, "disposing" arranging and arranging or deciding a position, and "engaging". Is to engage and stop with "locking", "contact" to make contact with the abutting state, "rotation" to make circular motion in the forward and reverse directions, and "sliding contact" to It means to move in a rubbing state.

First, a cleaning mechanism of a general fixing device to which the present invention is applied will be described with reference to FIG. FIG. 1 is a schematic diagram showing a cleaning mechanism of a general fixing device to which the present invention is applied.
In the fixing device shown in FIG. 1, a fixing member 2 including a heater 2a as a heating unit as a heating unit and a fixing nip portion, which is a pressure contact area between the pressure member 3 and a fixing member 2 on a sheet S as a recording medium. Heat and pressure are applied to the toner image formed by the unfixed toner T carried to melt the toner image, and the toner image is fixed on the paper S. The fixing member 2 is composed of a fixing roller, the surface of which is endlessly moved for fixing, and the pressing member 3 of a pressure roller is also formed by pressing the fixing member 2 by its endless movement. Heat and pressure are applied in the fixing nip portion.

  Incidentally, the toner T melted in the fixing nip portion may adhere to the fixing member 2 instead of being entirely fixed on the sheet S after passing through the fixing nip portion. Then, a part of the toner T attached to the fixing member 2 in the fixing nip portion moves with the rotation of the fixing member 2 while being attached to the surface of the fixing member 2. Therefore, the toner T transferred to the fixing member 2 by the offset is the sheet separating claw 11 that contacts the fixing member 2, the surface temperature detection sensor 4 that detects the surface temperature of the fixing member 2, the fixing member 2 such as the pressing member 3. There was a problem that the member provided in contact with was soiled. Alternatively, there is a problem that the toner T attached to the surface of the fixing member 2 is attached to the sheet S at the time of the next sheet passage, and the sheet S is soiled.

Therefore, in order to prevent the above-described problems, a cleaning mechanism 10X1 for cleaning the toner T adhering to the surface of the fixing member 2 is generally provided by using a cleaning member that is pressed against the fixing member 2 with a predetermined pressure. Has been.
In a general cleaning mechanism 10X1, a cleaning web 5 for rubbing the surface of the fixing member 2 to clean the surface of the fixing member 2, a web holding member 6 for holding the cleaning web 5 so as to be sent out, and a cleaning web. A cleaning web take-up roller 7 capable of winding 5 and a pressing member 8 for pressing the cleaning web 5 against the fixing member 2 are provided. In FIG. 1, X indicates a web winding direction which is also a web feeding direction.

  Then, the cleaning web take-up roller 7 rotates in a winding direction at a predetermined timing, so that a new portion (a portion not in contact with the fixing member 2) of the cleaning web 5 is gradually moved from the web holding member 6 side. It moves to the nip part. As a result, the toner T attached to the surface of the fixing member 2 is removed.

However, undulations and wrinkles may occur in the cleaning web, and the web nip between the pressing member 8 and the fixing member 2 that press the cleaning web 5 against the fixing member 2 cannot be sufficiently secured, and the cleaning performance may deteriorate. It was
Therefore, there is one that employs the cleaning mechanism 10X2 shown in FIG. FIG. 2 is a schematic diagram showing the cleaning mechanism 10X2 of the fixing device to which the present invention is applied. In the cleaning mechanism 10X2, a mechanism for providing the web holding member 6 that holds the cleaning web 5 so that the cleaning web 5 can be delivered with the web wrinkle preventing leaf spring member 9 that applies pressure to the cleaning web 5 as a cleaning web wrinkle preventing member. I try to prevent wrinkles. The leaf spring member 9 is in pressure contact with the cleaning web 5 in the width direction orthogonal to the winding direction X of the cleaning web 5 (the cleaning web 5 on the outer peripheral surface held by the web holding member 6 in the example of FIG. 2). Functions as a member.

  However, in the cleaning mechanism using the leaf spring member 9 as the web wrinkle preventing member, there is a problem that it is difficult to assemble due to the pressure of the leaf spring member 9 when the cleaning web is replaced. That is, when the cleaning web is replaced, the cleaning web 5 is usually wound and replaced with the web holding member 6 having a large outer peripheral diameter, so that the pressure (reaction force) applied to the leaf spring member 9 is correspondingly increased, and the leaf spring is increased. It was very difficult to hold the member 9 manually or hold it with a temporary jig or the like.

(Embodiment 1)
The cleaning web unit 10 according to the first embodiment will be described with reference to FIGS. 3 to 8. The cleaning web unit 10 according to the first embodiment has a configuration capable of solving the above-described problem (difficulty in assembling the leaf spring member due to the pressure of the leaf spring member when assembling the leaf spring member during replacement of the cleaning web). .
FIG. 3 is a perspective view of a main part of the cleaning web unit according to the first embodiment as viewed from the front side. FIG. 4 is a perspective view showing a single shape of the leaf spring member 9 before assembly. FIG. 5 is a view seen from the arrow K side in FIG. 3, and is a perspective view showing an arrangement state of the leaf spring member 9 and the holding frame 60 at the time of assembly. FIG. 6A is a front view of the main part showing a state in which the leaf spring member is temporarily held by the temporary holding means of the cleaning web unit according to the first embodiment via the holding frame, FIG. 6B. [FIG. 8] is a front view of a main part showing an assembling state in which the leaf spring member 9 is temporarily held via a holding frame 60 and can be attached to the frame. 7A is a front view showing a state where the leaf spring member 9 is assembled to the frame via the holding frame 60, and FIG. 7B is a view of FIG. 7A viewed from the direction of the arrow J. It is a perspective view of a part. FIG. 8 is a perspective view of a main part of the cleaning web unit 10 according to the first embodiment as viewed from the back side.

The cleaning mechanism as the cleaning unit according to the first exemplary embodiment is mainly different from the cleaning mechanism 10X2 illustrated in FIG. 2 in that the cleaning mechanism includes the cleaning web unit 10. The other cleaning mechanism according to the first embodiment is similar to the cleaning mechanism 10X2 shown in FIG.
The cleaning web unit 10 has a temporary holding means for temporarily holding the leaf spring member 9, a mounting / demounting means for the pressing member 8, and a unit main body for supporting the web holding member 6, the pressing member 8 and the like. The unit body is also the apparatus body of the fixing device.

As shown in FIG. 3, the cleaning web unit 10 includes a pair of frames 50L and 50R as a main body of the cleaning web unit, a web holding member 6, a pressing member 8, a leaf spring member 9 as a pressure contact member, and a leaf spring member. It has a holding frame 60 and the like as a pressure contact holding member for holding 9.
The web holding member 6 and the pressing member 8 are rotatably supported between the frames 50L and 50R. Although not shown in FIG. 3 because it is hidden, the winding roller 7 shown in FIG. 2 is also rotatably supported similarly to the above. As shown in FIG. 3, U-shaped grooves 53 for attaching and detaching the shaft 8a of the pressing member 8 are formed in the frames 50L and 50R, respectively.

The frame 50L is the frame at the left end in the figure which is one end in the width direction Y (also the width direction of the cleaning web 5), and the frame 50R is the frame at the right end in the figure which is the other end in the width direction Y. ing. The frames 50L and 50R are connected by a connection frame 50C as shown in a part of FIG. 8 described later. The frames 50L, 50R and the frame 50C are integrally formed by sheet metal, and a required rigidity strength is secured.
As shown in FIG. 6A, a convex portion 52 as a convex portion is formed in the lower portion of the frame 50L, and a hole 51 penetrating in the width direction Y is formed in the lower portion of the frame 50R.

  The leaf spring member 9 is formed of a stainless steel thin plate having a predetermined thickness, which is an elastic member made of metal. As shown in FIG. 4, the leaf spring member 9 has a fixing surface 9a fixed to the holding frame 60 in a single unit before assembly, and an outer peripheral surface of the web holding member 6 immediately after replacement (in this case, of the web holding member 6). The outer peripheral diameter is the largest) and the pressure contact surface 9b that is in pressure contact with the upper cleaning web 5 is bent to form an acute angle θ of about 48 degrees.

As shown in FIG. 5, the leaf spring member 9 presses against the cleaning web 5 on the outer peripheral surface of the web holding member 6 during assembly, so that a reaction force is generated, which prevents the cleaning web 5 from shifting or wrinkling. It works most effectively.
If it is not necessary to obtain the maximum effect described above, in FIG. 2, the leaf spring is pressed against the cleaning web 5 near the web holding member 6 between the web holding member 6 and the pressing member 8 in FIG. The member 9 may be arranged.

  On the other hand, since the leaf spring member 9 is arranged so as to be in pressure contact with the cleaning web 5 on the outer peripheral surface of the web holding member 6, the above-mentioned acute angle θ when assembling the leaf spring member 9 when replacing the cleaning web is set. In order to increase the size, in other words, the bending portion of the leaf spring member 9 receives a force forcibly pushing it open. As a result, it becomes very difficult to hold the leaf spring member 9 due to the reaction force due to the larger pressure contact force of the leaf spring member 9, especially when replacing the new web holding member 6 having the largest outer diameter. It was difficult to assemble the leaf spring member 9 of FIG.

  In the first embodiment, even if the outer peripheral diameter becomes the minimum diameter as the cleaning web 5 on the outer peripheral surface of the web holding member 6 is used, the leaf spring member 9 cleans the web holding member 6 having the minimum diameter. The shape and the like are configured so as to be pressed against the web 5. Reference numeral 9c is a fold back that prevents the cleaning web 5 from being caught when the leaf spring member 9 is pressed against the cleaning web 5.

As shown in FIG. 3, the leaf spring member 9 is held via the screw 70 while being positioned in the three-dimensional direction by the fixed surface 9 a that is in surface contact with the master-slave reference pin and the reference surface of the holding frame 60. The frame 60 is fastened and fixed to four places. The holding frame 60 is made of sheet metal and is appropriately bent to ensure the required rigidity.
As shown in FIGS. 3 and 5, in the drawings of the holding frame 60, notches are formed at the left and right ends, so that the pressing force by the spring elasticity of the leaf spring member 9 is applied to the cleaning web 5 as described above. It has become.

  As shown in FIG. 6A, a stepped square hole 62 engageable with the convex portion 52 of the frame 50L is formed at the left end of the holding frame 60 in the drawing. A screw insertion hole 63 is formed in the right end portion of the holding frame 60 in the figure, and a pin 61 as a rod-shaped member that can be inserted into the hole 51 of the frame 50R is formed so as to project to the outside in the width direction Y. ing.

  As described above, the convex portion 52 of the frame 50L, the square hole 62 of the holding frame 60, the hole 51 of the frame 50R, and the pin 61 of the holding frame 60 constitute the temporary holding means of the present invention. The temporary holding means attaches the leaf spring member 9 to the frames 50L and 50R while the leaf spring member 9 is in pressure contact with the cleaning web 5 when the leaf spring member 9 is assembled through the holding frame 60 when the cleaning web 5 is replaced. It is a function to temporarily hold.

The operation of the temporary holding means will be described. On the right side shown in FIG. 6A, the pin 61 of the holding frame 60 is inserted into the hole 51 of the frame 50R, and on the left side shown in FIG. 6A, the convex shaped portion 52 of the frame 50L is inserted into the square hole 62 of the holding frame 60. Hook.
As described above, as shown in FIGS. 3 and 5, when the web holding member 6 having the largest outer diameter is replaced, the large pressing force of the leaf spring member 9 is applied to the cleaning web 5 on the web holding member 6. Even if the reaction force due to this always acts on the holding frame 60, the holding frame 60 is in a state of being unable to pop out, and in this state, the leaf spring member 9 can be temporarily held by the frames 50L, 50R.

When the holding frame 60 is moved and slid in the width direction Ya by a predetermined amount as shown in FIG. 6B from the temporary holding state of the plate spring member 9 via the holding frame 60 of FIG. The leaf spring member 9 can be assembled to the frames 50L and 50R via the holding frame 60 without receiving a reaction force which is an influence of the pressure contact force of the spring member 9.
At this time, the convex portion 52 of the frame 50L is in a state of being locked in the stepped upper square hole 62a of the square hole 62 in the holding frame 60. As a result, the leaf spring member 9 can be assembled to the frames 50L and 50R via the holding frame 60 without being affected by the pressure contact force of the leaf spring member 9.

In the state of FIG. 6B in which the leaf spring member 9 can be assembled to the frames 50L and 50R via the holding frame 60, as shown in FIG. 7A, the left end portion of the holding frame 60 in the drawing. By assembling and fixing the right end portion of the holding frame 60 to the frames 50L and 50R with the screw 70 in the drawing, the assembly is completed.
In the assembled state, as shown in FIG. 7B, the left end of the holding frame 60 in the drawing is formed by the surface of the holding frame 60 that is in surface contact with the master-slave reference pin of the frame 50L and the reference surface of the frame 50L. While being positioned in the three-dimensional direction, the holding frame 60 is fastened and fixed to the frame 50L with screws 70.

  As described above, according to the first embodiment, the leaf spring member can be temporarily held by the temporary holding means when the leaf spring member is assembled when the cleaning web is exchanged. Can be improved. Furthermore, the work time of the service person can be shortened, and the work cost of the service person can be reduced.

  The pressing member 8 of the cleaning mechanism 10X2 shown in FIG. 2 is pressed against the fixing member 2 by a spring, and in most cases, the pressing member 8 and the spring are pressed into the interior of the cleaning web unit. Therefore, there is a problem that it is difficult to replace the pressing member 8 when the cleaning web is replaced or when the pressing member is replaced.

An attachment / detachment mechanism that allows easy removal of the pressing member 8 included in the cleaning web unit 10 will be described with reference to FIGS. 3 and 8.
As shown in FIG. 3, a holding member 65L that holds one end of the shaft 8a of the pressing member 8 is fastened and fixed to the frame 50L via a screw 66. Further, as shown in FIG. 8, a holding member 65R holding the other end of the shaft 8a of the pressing member 8 is fastened and fixed to the frame 50R via a screw 66.

Inside the holding member 65L, there are a bearing 67 that rotatably supports one end of the shaft 8a of the pressing member 8 and a compression spring 68 that urges the bearing 67 in a direction to press the pressing member 8 against the fixing member. It is stored. Further, a bearing 67 that rotatably supports the other end of the shaft 8a of the pressing member 8 inside the holding member 65R, and a compression spring that urges the bearing 67 in a direction to press the pressing member 8 against the fixing member. 68 and 68 are stored. In the bearing 67, the convex portions formed on both sides of the bearing 67 engage with the concave grooves formed inside the holding members 65L and 65R so as to face each other, whereby the biasing force of the compression spring 68 is increased. It is supported to move back and forth through.
Further, one end and the other end of the shaft 8a of the pressing member 8 are formed in a stepped shape, and the bearing 67 can rotate the stepped small diameter part of the one end and the other end of the shaft 8a of the pressing member 8. Support.

  As shown in FIG. 3, the holding member 65L is fastened to the frame 50L with a screw 66 while being positioned in the three-dimensional direction by a reference plane for fixing the holding member 65L and the master-slave reference pin arranged on the frame 50L.・ Fixed. Similarly, as shown in FIG. 8, the holding member 65R is positioned in the three-dimensional direction by the master-slave reference pin arranged on the frame 50R and the reference surface for fixing the holding member 65R, and the frame is fixed by the screw 66. It is fastened and fixed to 50R.

As described above, the holding member 65L that holds the shaft 8a at one end of the pressing member 8 and the holding member 65R that holds the shaft 8a at the other end of the pressing member 8 are provided independently of each other. That is, the holding member 65L and the holding member 65R are provided in line symmetry with respect to the center line of the pressing member 8 in the width direction Y.
By removing either one of the holding members 65L and 65R, for example, the screw 66 of the holding member 65L fixed to the frame 50L, the holding member 65L can be removed from the frame 50L. Then, the shaft 8a at one end of the pressing member 8 is pulled out to the upper left side in FIG. 3 from the U-shaped notch groove 53 formed in the frame 50L, so that the holding member 65R fixed to the frame 50R is pressed. The shaft 8a at the other end of the member 8 can be easily removed. Conversely, when the holding member 65R is removed from the frame 50R, similarly, the shaft 8a at one end of the pressing member 8 can be easily removed from the holding member 65L fixed to the frame 50L.

  As described above, according to the first embodiment, the holding members 65L and 65R that hold and fix the shaft 8a at one end and the shaft 8a at the other end of the pressing member 8 are independently arranged. Thus, the workability of exchanging the pressing member 8 can be improved, the work time of the service person can be shortened, and the work cost of the service person can be reduced.

  FIG. 9 is a schematic configuration diagram of an image forming apparatus including a fixing device to which the present invention is applied. In FIG. 9, the reading unit 12 is provided to scan a document placed on the pressure plate, and is composed of a contact glass 20 on which the document is placed and an optical scanning system. The optical scanning system includes an exposure lamp 13, a first mirror 14, a second mirror 17, a third mirror 18, a lens 15, a CCD image sensor 16 and the like. The original image is read by the CCD image sensor 16, converted into an electric signal and processed.

  In a sheet document automatic reading apparatus A for automatically reading a sheet document, a document placed on a document table B is fed by a feeding roller C to a position of a document reading sensor G. The document passes through the document reading sensor G at a constant speed as it is, and the image on the front side of the document is read by the document reading sensor G at this time. The read image data is sequentially stored in the image memory after being subjected to image processing (various corrections, compressions, etc.).

  The writing unit 49 includes a laser output unit 19, an image forming lens 21, and a mirror 22. In the writing unit 49, the laser light output from the writing unit 49 is applied to the photoconductor 30 of the image forming system.

The procedure for printing the image formed on the photoconductor 30 is roughly as follows.
The sheets stacked on the first tray 23, the second tray 24, and the third tray 25 are fed by the first sheet feeding device 26, the second sheet feeding device 27, and the third sheet feeding device 28, respectively, and the vertical conveyance unit It is conveyed to a position before the photoconductor 30 by 29.

The image data on the image memory is written on the photoconductor 30 by the laser light from the writing unit 49, and passes through the developing unit 35 to form a toner image.
The toner image on the photoconductor 30 is transferred while the sheet is conveyed by the conveyance belt 31 at the same speed as the rotation of the photoconductor 30 according to the movement of the toner image. After that, the image is fixed by the fixing device 1 and is ejected to the paper ejection tray 33 by the paper ejection unit 32.

  When images are formed on both sides, the reversal path switching claws are switched for the sheets that have been fed from the sheet feed trays 23 to 25 and on which images have been formed. As a result, the sheet is not guided to the discharge tray 33 side but is conveyed to the double-sided entrance conveyance path 38, is guided to the reversing unit 37 provided in the double-sided conveyance unit 36, and is temporarily stored in the switchback conveyance path 41. The sheet is unwound in the reverse direction (refeeding direction) by the return conveying means, guided downward by the reverse sheet discharge switching claw and inverted, and is sent to the double-sided intermediate conveying path 43 provided below it. Then, by the intermediate conveyance means 40 and the double-sided exit conveyance means 42 connected to the drive source, the paper is again sent to the vertical conveyance unit 29, the image is printed on the back surface, and then the paper is ejected.

  In the case of reversing and ejecting the sheet, the sheet switched back by the reversing unit 37 is sent out to the reversing sheet discharging and conveying path 39 without passing through the double-sided intermediate conveying path 43 by the sheet discharging and reversing switching claw, and is discharged again. It is returned to the paper unit 32 and discharged to the outside of the main body.

The sheet discharged from the main body is discharged to either the discharge tray 33 or the finisher 44 of the main body by the discharge destination switching claw. The sheet discharged to the finisher 44 passes through a punch unit 48 for punch hole processing, and is temporarily stacked on a stack tray 45 for staple processing.
After all the sheets are stored in the stack tray, the sheet bundle is bound by the stapler unit 46 and discharged to the discharge tray 47.

  Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this particular embodiment, and the present invention described in the scope of claims unless otherwise limited in the above description. Various modifications and changes can be made within the scope of the above. For example, the technical matters described in the above-described embodiments and examples may be appropriately combined.

  The fixing device including the cleaning web unit 10 according to the first exemplary embodiment is a heat roller type fixing device including a fixing roller and a pressure roller. However, another type of fixing device, for example, FIG. It is also applicable to a belt fixing device using the fixing belt shown. The member to be cleaned by the cleaning web means (mechanism / device) is not limited to the fixing roller which is a fixing member, and may be a pressure roller which is a pressure member, or both the fixing roller and the pressure roller. .

  The effects appropriately described in the embodiments of the present invention only list the most suitable effects resulting from the present invention, and the effects according to the present invention are limited to those described in the embodiments of the present invention. Not a thing.

1 Fixing Device 2 Fixing Member 2a Heating Section (Example of Heating Means)
3 pressing member 5 cleaning web 6 web holding member 7 winding roller (an example of winding member)
8 Pressing member 9 Leaf spring member (an example of pressure contact member)
10 Cleaning web unit 50L, 50R frame (an example of device body)
51 holes (components of primary holding means)
52 Convex portion (convex portion, constituent element of primary holding means)
53 notch groove 60 holding frame (an example of pressure contact holding member)
61 pin (element of primary holding means)
62 Square Hole (Constituent Element of Primary Holding Means)
65L, 65R Holding member 66 Screw 67 Bearing 68 Compression spring 70 Screw X Web winding direction Y Width direction, longitudinal direction

JP, 2012-042546, A

Claims (6)

  1. A fixing member having a heating means, a pressure member contacting the fixing member to form a fixing nip portion between the fixing member, and a cleaning means for cleaning the fixing member or the surface of the pressure member. Equipped with
    A fixing device for allowing a recording medium holding a toner image to pass through the fixing nip portion, and fixing the toner image on the recording medium by heat and pressure,
    The cleaning means is
    A cleaning web for rubbing the surface of the fixing member or the pressure member to clean the surface of the fixing member or the pressure member,
    A web holding member that holds the cleaning web so that it can be sent out,
    A winding member capable of winding the cleaning web,
    A pressing member for pressing the cleaning web against the fixing member or the pressing member,
    A pressure contact member for preventing cleaning web wrinkles, which is in pressure contact with the cleaning web in the width direction orthogonal to the winding direction of the cleaning web,
    A temporary holding means for temporarily holding the pressure contact member when assembling the pressure contact member ,
    The press contact member is held by a press contact holding member protruding from each end portion in the width direction of the press contact member,
    The temporary holding means includes a rod-shaped member formed at one end of the pressure-contact holding member and protruding in the width direction, and a hole formed in the device body into which the rod-shaped member can be inserted. A fixing device comprising a stepped square hole formed at the other end and a convex portion formed on the main body of the apparatus that is engageable with the square hole .
  2. The fixing device according to claim 1,
    The fixing device is characterized in that the pressure contact member is a metal leaf spring member.
  3. The fixing device according to claim 1 or 2,
    The fixing device is characterized in that the pressure contact member is arranged at a position in pressure contact with the cleaning web held by the web holding member.
  4. The fixing device according to any one of claims 1 to 3,
    A fixing device, wherein the pressure contact holding member can be assembled to the apparatus main body in a state where the pressure contact holding member is moved by a predetermined amount in the width direction .
  5. The fixing device according to any one of claims 1 to 4 ,
    A fixing device , wherein each holding member for holding one end and the other end of the pressing member is independent at the one end and the other end, respectively .
  6. An image forming apparatus comprising the fixing device according to claim 1.
JP2016129176A 2016-06-29 2016-06-29 Fixing device and image forming apparatus Active JP6686739B2 (en)

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JP2016129176A JP6686739B2 (en) 2016-06-29 2016-06-29 Fixing device and image forming apparatus
US15/621,370 US10061243B2 (en) 2016-06-29 2017-06-13 Fixing device and image forming apparatus incorporating same
EP17178126.3A EP3264193B1 (en) 2016-06-29 2017-06-27 Fixing device and image forming apparatus incorporating same

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JP2018004831A (en) 2018-01-11
EP3264193A1 (en) 2018-01-03
US20180004137A1 (en) 2018-01-04
US10061243B2 (en) 2018-08-28

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